The ordinary filmmaker thinks we could see two Nikon Z8 cameras. One camera would be focused on delivering a solution for photographers while the other camera would provide capabilities aimed at videographers. No evidence has been given, but the Ordinary Filmmaker believes it is plausible citing the Canon R5, and the R5c; the Panasonic S1 and the S1h; the Fujifilm X-H2 and X-H2s.
Nikon Rumors says that the teaser campaign will start soon so we should know soon enough.